Method of cutting bolt holes



Nov. 2, 1926. 1,605,493

D. E. ANDERSON METHOD OF CUTTING BOLT HOLES Orizinal Fil Anril 26; 1923Patented Nov. 2, 1926.

UNITED STATUE DAVID E. ANDERSON, OF ST. PAUL, MINNESOTA.

METHOD OF CUTTING BOLT HOLES.

Original application filed April 26, 1923, Serial No. 634,921.

My invention relates to the method of cutting bolt holes in a rail orother article where it is desired to cut through a piece of steel in theshortest possible time to save labor and expense of cutting such holes.This application in a division of my patent application, Serial Number634,921, filed April 26th, 1923.

A feature of the invention resides in the use of a guide to assist incutting a certain shaped hole which is used in connection with thenozzle of an acetylene blow torch in a manner so as to cut a hole in arailroad rail. or other'article. The method includes a means of cuttinga hole so thatthe fractured portion of the rail or article being cut isentirely cut away so that the strength of the article cut is notimpaired by cutting with a blow torch flame. In using a blow torch tocut holes in articles of steel, the fine acetylene flame penetratesthrough the material making a hole and this intense heat striking thecold steel fractures the same about the hole which is first cut throughthe material. My method is designed to entirely cut away the fracturedportion made by the first penetrating hole of the acetylene flame.

The method includes the burning of a hole in a rail or other articlebyplacing the blow torch nozzle in the center of the area which is to becut away and burning a hole through the material, then following directfrom this point to the outer periphery of the area to be cut away andaround the periphery of the area being cut away, so that when theportion is cut away fromthe article to form a hole therein, the startingpoint of the blow torch flame or the first penetrating hole of the flameis entirely cut away, and thus the fractured portion of the steel ormetal which was fractured about the penetrating hole is entirely cutaway and the strength and resistance of the article in which the holewas cut is not destroyed.

My method of cutting bolt holes applies particularly to railroad railsand the like where it is desirable to out these holes out on the rightof way at a minimum expense and in the shortest time. It is apparent,however, that m'y method of cutting holes in metal is equally welladaptable for other purposes.

Divided and. this application filed January Serial No. 83,775.

In the drawings forming part of my specification:

Figure 1 illustrates a side sectional view of 'a railroad rail in theact of being cut by my method.

Figure 2 is a side view of a portion of a railroad rail to illustratethe carrying out of my method.

Figure 3 illustrates in perspective the cut away portion which is cutfrom the rail in'malring a bolt hole with my method.

Figure 4 illustrates one form of a template which may be used incarrying out my method.

In carrying out my method I employ any suitable blow torch which may beprovided with a nozzle such as A, the drawings only illustrating thenozzle of the blow torch, as the remainder of the blow torch is ofordinary well known construction.

My method is particularly adaptable to cut bolt holes in railroad railssuch as B and I have illustrated the blow torch nozzle A operating witha template 0 which has a guide ring 10 for the end 11 of the nozzle A,so that the nozzle end 11 can follow around the inner surface 12 of theguide ring 10 on the template C.

In carrying out my method to out bolt holes in a railroad rail such asB, the blow torch nozzle 11 is placed centrally of the area 13 to be cutaway at the point 14 and held at this point until a hole is cutcompletely through the rail B at the point 14, then following along thedotted line 15 to the circumference or periphery 16, and following aboutthe circumference 16 to cut away the entire area 13.

In Figure 3 I illustrate the cut-away portion 13 with the center hole 14cut through the same and showing the cut-away portion as a plug toclearly illustrate the cut-away portion which forms a clean-cut bolthole such as 17 in the rail B.

My method provides an economical means of cutting a hole in a rail orother article where it is desired to cut away a portion from the sameand wherein it is desired and particularly important not to destroy thewearing qualities of the steel which is cut so that the same may r'emaintough and immune from fractures when placed under heavy strain. Inrailroad rails it is very imperizan; that the bait liaise i? fur nectingthe ends of the respective rails together, be made in a manner so as notto fracture the rail by the intense heat of the blow torch or otherinstrument so as to destroy the efficiency and qualities of the steelmaking the rail. I have found that my method accomplishes this result bycutting away the fractured portion of the rail which is in and about thehole l l, as this is the point where the rail takes the shock of theheat in cutting the hole through the same and as the hole is cut throughthe knifelike action of the acetylene torch flame cuts up to thepeiphery of the area to be cut out very easily and rapidly. This portionof the rail has been heated by reason of the radiation of the heat fromthe point 14, sufliciently so that the cutting of the flame around theperiphery of the area being cut out to form the desired opening in therail B or other article wherein it is desired to cut a hole. willnotfracture the steel along the line of cutting by the flame of the blowtorch but will cut the portion out clean andcompletely so that the holeis formed in the rail B or other article without destroying theefficiency of the steel and making a very desirable means of cuttingbolt holes in railroad rails.

I have used my method in cutting bolt holes in railroad rails quiteextensively and have found it to be most desirable, saving time andlabor and thereby providing means for permitting the replacement ofrails in a short time after they are delivered at the place on theright-of-way where they are to be installed. This has many advantages asit permits new rails to be installed without holding up transportationvery long and providing a method which I believe is far in advance ofcutting the bolt holes by any other means, in so far as I know.

In accordance with the Patent statutes 1 have described the principlesof my method of cutting holes in steel or other material and. while Ihave described a particular method, I desire to have it understood thatthis is only illustrative and that the invention can be carried out byother means and applied to uses other than those above set forth withinthe scope of the following claims.

I claim:

l. The method of cutting a bolt hole in a rail, consisting in placing ablow torch nozzle centrally to a guide and burning a hole directlythrough the rail, then following the guide substantially as described.

The method of burning; a hole in a rail consisting' in placing a torchin the center of a template guide and burning a hole through the railand then following the template guide to cut a hole through the rail.

3. The method of cutting a hole consisting in placing a blow torchnozzle centrally to the portion to be cut away and burning a holedirectly through the article to be cut out, then cutting; from. thecenter outwardly and around to entirely cutout the center starting holeto entirely cut away the fractured portion at the starting hole.

4. The method of burning a hole consisting in placing a blow torchnozzle centrally of the portion to be cut avay and holding the same atthis point until a hole is penetrated through the part to be cut away atthe center thereof, then cutting outwardly from this center holev andfollowing around to entirely cut away the center hole to eliminate anyfractured. portion caused by cutting the center hole.

DAVID E. ANDERSON.

